You can enable ClearCase integration for any directory. However, since it is not possible to configure a
ClearCase view in IntelliJ IDEA, such directory should be already a ClearCase object,
i.e. should exist within a ClearCase view.

As of this writing, CCRC client is not supported.

ClearCase Support

When ClearCase integration with IntelliJ IDEA is enabled, the ClearCase item appears
on the VCS menu, and on the context menus of the Editor and Project views.

The files in the folders under the ClearCase control are highlighted according to their status. See File Status Highlights for file status highlighting conventions.